/Engine/Source/Runtime/Engine/Classes/Kismet/KismetArrayLibrary.h
Swaps the elements at the specified positions in the specified array If the specified positions are equal, invoking this method leaves the array unchanged
static void Array_Swap ( const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & TargetArray, int32 FirstIndex, int32 SecondIndex )